Programming --> http://www.oreilly.com/programming/free/
Data --> http://www.oreilly.com/data/free/
Business --> http://www.oreilly.com/business/free/
Design --> http://www.oreilly.com/design/free/
Security --> http://www.oreilly.com/security/free/
Web Dev --> http://www.oreilly.com/web-platform/free/
Web Ops --> http://www.oreilly.com/webops-perf/free/
Seem to be in ePub, mobi and PDF formats.
Data --> http://www.oreilly.com/data/free/
Business --> http://www.oreilly.com/business/free/
Design --> http://www.oreilly.com/design/free/
Security --> http://www.oreilly.com/security/free/
Web Dev --> http://www.oreilly.com/web-platform/free/
Web Ops --> http://www.oreilly.com/webops-perf/free/
Seem to be in ePub, mobi and PDF formats.
